Motor-controlling apparatus



Aug-11, 1925. 1,549,324

C. W. MOORE MOTOR CONTROLLI NG APPARATUS F le y 2, 17924 3 Sheets-Sheet 1 Aug-11, 1925. 1,549,324

. W. MOORE MOTOR CONTROLLING 'APPARATUS Filed May 2, 1924 3 Sheets-$heet 2 Aug. 11, 1925. 1,549,324

- C. W. MOORE MOTOR CONTROLLING APPARATUS Filed y 1924 s Sheets-Shet 3 Patented Aug. 11, 1925.

ATE, -FF1CE.

. CLARENCE 'W'. MOORE, OF ROSLYN, PENNSYLVANIA, ASSIGNOR TO ELECTED DENTAL MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, .A CORPORA- TION OF PENNSYLVANIA.

MOTGRrCONTROLLING APPARATUS.

Application filed, May 2 To all whom it may concern.

Be it known that I, CLAnnNon 1 V. Moons, a citizen of the United States, residing in Roslyn, Pennsylvania, have invented, a liIotor-Controlling Apparatus, of which the following is a specification.

hly invent-ion relates to control mechanisms, having particular relation to such mechanisms as are adapted to control dynamo-electric devices.

One object of my invention is to provide apparatus of the class described which is characterized by its simplicity of design, cheapness of construction and absence of complicated working parts.

Another object of my invention is to provide a system of control embodying a dynamo-electric device provided with speed-varying means, a switch for controlling the operation of said device, and common means for controlling said. speed varying means and said switch.

A further object of my invention is to provide a novel system of control for the actuating element of a dental chair which comprises a reversible driving motor provided with brush-shitting apparatus, a switch for controllingthe operation of said driving motor, common means for eiiecting the operation of said switch and said brushshifting mechanism and trip mechanism operable when the dental chair has moved to either of its extreme positions to cause said switch to render ineffective said. driving motor.

Other objects and applications of my invention, as Well as details of construction and operation, whereby my invention may be practiced, will appear more fully herein alt-er, when taken in connection with the so companying drawings, wherein,

Fig. 1 is a diagra .nnatic view, partially in section, out circuits and apparatus embodying my invention;

Fig. 2 is a top plan view or the structure of Fig. 1;

Fig. 3 is an end elevational view, partially in section, of the structure of Fig. and

4. is a horizontal sectional view of the switch-actuating llleCliitIilSHl, the section plane being indicated by the line lVliV of Fig. 1.

In the illustrated form of embodiment of my invention shown in the drawing, I pro- 1924. Serial No. 710,696.

vide a reversible driving motor 1 comprising a frame 2. and an armature shaft 3. A. pair of brushes 1 and 5 are resiliently mounted on arms 6 and 7, respectively, of a brush carrier 8, the latter being loosely mounted on the armature shaft 3, so that a. movement of the brush carrier 8- causes the. position of the brushes 1 and 5 to change with respect to the remaining electrical parts of. the motor 1.

The motor 1 may be of the series compensated type, and it is so designed that successive shifting of the brushes at and 5 from the neutral position shown in the drawing causes successive reversals in the direction of rotation of the armature shaft 3 the speed of said motor being dependent upon the extent of movement of said brushes 4 and 5 from the neutral position. ;The outer ends of the brush arms 6 and 7 are provided with spring contact elements 9 and 10, respectively, which. are adapted to engage stationarycontact elements 11 and 12 mount ed on the inner periphery of the motor frame 2, so that an electrical contact iscontinuously maintained with the stationary contact elements 11 and 12, as the brushes a and 5 are shifted in either direction from their neutral position. The armature shaft 3 may be mechanically connected through gearing (not shown) with dental-chair elevating and lowering ap 'iaratus 13, though of course my invention isnot to be limited to such apparatus. a

, The energization o'f-the driving'motor 1 may be controlled through a switch 14 which is connected in series circuit relation with a motor-energizing circuit 15 having a plug element 16 adapted to be connected to a live socket element 17. The energizing circuit 15 further includes the stationary condncting elements 11 and 12 mounted on the motor :rame 2, so that when the socket 1T engages the plug 16, the motor 1 becomes operative innnediately upon the closing of the motor-controlling switch 1 1. The motorcontrolling switch 1 1 is of usual design and it includes a push button 18, which is normally maintained in a forward position under the spring action of the switch parts,

the switch 1 1 normally assuming its open position.

As hereinabove noted, an important feature of my invention. is the provision of. a system of control, wherein the switch 1 1 and of the shaft the movable brush carrier or speed-control element 8 of the driving motor 1 are controlled by common operating means. To this end, I provide a connnon actuating lever 19 which may be mounted to move in a horizontal plane by a vertically extending supporting post 21 journaled in upper and lower supporting frames 22 and 23, respectively. The movement of the lever 19 may be transmitted to the brush carrier 8 by means of adjustable linkage 2d confiprising an arm 25, which extends outwardly from the supporting post 21, and a pair of links 26 and 27 which are pivotally secured respectively, to the outer end of the arm 25 and to a projecting portion 28 of the brush carrier 8.

The connection between the links 26 and 27 may be made adjustable by rigidly securing on th former a pair of spaced collars 29 and 31 adapted to slidably engage the link 27, and by rigidly mounting on the latter, intermediate said collars 29 and 31, :1 collar 32 which is adapted toslidably engage the link 26. In such construction, the brush carrier 8 is inoperative as the common actuating lever 19 moves through an angle sufficient to move the collar 29 out of engagement with one face of the collar 32 and the collar 31 into engagement with the other face of said collar 32. This time interval may be varied by adjusting th spacing of the collars 29 and 31.. A further adjustment may be made by moving the collar 32 relative to the collars 29 and 31.

' The common actuating lever 19 may be resiliently held in the neutral position shown in Fig. 1 of the drawing by means of a resilient abutment 33 which engages oppositely extending arms 34 and 35 carried by the upper end portion 36 of the supporting post 21; The abutment 33 is provided with a rcarwardly extending tubular portion 37 which telescopically engages a stationary pin 38 carried by a fixed supporting member 39. A spring 41 encircles the elements 37 and 38, abutting the fixed supporting member 39 and the resilient member 33. Such arrangement operates to resiliently maintain the operating lever 19 in a neutral position inasmuch as a movement of the arms 34- and 35 in either direction is resisted by the force of the spring 41.

The common actuating lever 19 may effeet the successive opening and closing of the switch 14 through an integral extension 42 thereof. The outer end of the extension 42 is provided with spaced shoulders and 4 1 which are adapted to engage opposite sides of a horizontally positioned arm 45. The arm 15 may be pivotally mounted for motion in a vertical plane on a vertically positioned shaft 46 which is journaled in spaced bearings 18 and 4:9. The lower end 16 is provided with oppositely extending projecting arms 5] and 52 (Fig.

the cams 4) having transversely adjustable pins 1' and 541, respectively. The end portions the pins 53 and engage pivoted links and 56, the free ends of the latter engaging the resiliently mounted push button 18, whereby the push button 18 may be moved inwardly to close the switch 1-1 when the vertical shaft 46 is turned in either direction from the neutral position shown in the drawing.

I11 view of the above construction, it can readily be seen that when the common act-uating lever 19 is moved in either direction from its neutral position, one of the shoulders 4314 is actuated into engagement with the pivoted arm 15, turning the arm in a horizontal plai'ie. The resulting turning movement ot the shaft 45 causes one of the adjustable pins 53 5'-1 to engage one of the adjacent pivoted links 56, the inward movement of which causes the closing of the switch 141; and the cnergization of the motor 1. This movement of the common actuating lever 19 through the adjustable linli'age 2%; causes the brushes 1 and 5 to assume their raising or lowering position, depending upon the direction of movement of the lever 19.

In order to prevent over travel of the chair elevating and lowering apparatus 13, I provide automatic trip 'mechanisn'i which is operable to cause the opening of the mo tor switch 1-1 at such desired times. One method of accomplishing this desired result is shown in the several figures of the drawing. wherein a pair of cams 57 and 58 extend in opposite directions from axially displaced portions oii a rotatable member 59. The rotatable member 59 is mounted transversely oi the vertically movable lever 415 on a supporting bracket 61. As shown in detail in F 2 and 3, the cams 5? and 58 are so positioned on opposite sides of the neutral position of the trip lever -15 that when the lever 15 is successively moved to the right and to the left, said cams 57 and 58 are successively positioned directly beneath the same.

. Inasmuch as either movement of the lever 1-5, whether to the right or to the left, is resisted by the resilient torce of the switch mechanism 141, it can be seen that if the lever 1-5 is actuated clear of the particulzu: restraining shoulder 13 or 1-1). the lever 45 is immediately returned to the neutral position shown in Fig. 3. thereby ermitting the switch 1% to move into it open position and, consequently, causing tl stopping of the driving motor 1. Accordin I y, 57 and 58 have been so designed that they can effect the raising of the lever 15 clear of the shoulrilcrs 4-3 and upon a rocking IDOYPHKHC of the member 9. whereby the above-11-z11ted o 'ieration may ensue.

The rocking movement 01? the member 59 may be effected by means of upper and lower lugs 62 and which respectively represent the upper and lower limits of travel of the chair elevating apparatus 13.

i The lugs 62 and 63 are adapted to engage successively an arm 64 of a lever 65 pivotall y mounted on a rigid supporting structure 66. A remaining arm 67 of the pivoted lever is connected through a link 68 and arm 69 to the member 59. In order that the cams 57 and 58 may be held in the neutral position shown in the drawing, the outer end of the member is provided with pinsTl and 72 which are spaced on opposite sides of the axis of the member 59. Corresponding sides of the pins 71 and 72 engage journals 73 and 742-, respectively, which are formed on a bearing member 75. The bearing member 75 has a 'slidably mounted shaft 76 carried by the supporting bracket 61, and it is resiliently held in the forward position shown in the drawing by means of a spring 77. The mounting afforded by the bearings 73 and Tel is such that whenthe member 59 is turned in one direction one pin, say 71, remains in its bearing 73 and the other pin 7 is actuated clear of the cooperating bearing 74-, and *ice versa when the member 59 moved in the opposite direction.

In operation, when the common actuating lever 19 is moved, say to the right, the shoulder of the arm engages the mem ber 45 to cause the closing of the switch 14. The closing of the switch l-l operates to effect the energization of the motor 1. The aforesaid movement of the lever 19 also causes the collar 29 to be actuated into engagement with the collar 82, resulting in the shifting of the brush holder 8 into, say, the raising position. The speed of the motor 1 may be now adjusted by actuating the brush holder 8 through the lever 19. The motor 1 continues to operate so long as the main control element 19 is held out of neutral position. Should the common actuating lever 19 be held open when the motor 9 has operated beyond its desired range of i'novement, that is, beyond the maximum upper position of the dental chair (not shown), lug 63 is actuated into engagement with the arm 64L of the pivoted lever 65, causing a turning movement of the member The turning movement of the member 59 being sufficient to cause the cam 57 to actuate the lever 45 out of engagement with the shoulder 43, the switch parts automatically move to their open or neutral position, whereupon the motor 1 becomes inoperative and the further raising of the dental chair (not shown) is. avoided. hen the common operating lever 19 moved to the left, the brush carrier 8 so actuated as to cause the lowering of the chair raising and lowering apparatus 13, and this lowering move ment continues until the lug (32' engages the arm 64; of the lever 65, causing the tripping of the lever 15 and the consequent returning of the switch mechanism let to its neutral position.

I have observed that some driving motors do not respond equally to equal reversals in the position of the brush carrier 8. In order, therefore, that the raising and lowering speed of the motor 1 may be made equal if desireehl move the collar 82 to one side of the neutral position shown in the drawing an amount suflicient to bring about this desired effect. Attention is also directed to the fact that the time interval between the operation of the switch 14 and the shift .ing of the brush carrier 8 may be adjusted from zero to a desired maximum value by varying the spacing of the collars 29 and VVhile l have shown only one form of embodiment of my invention, for the purposes of describing the same and illustrating its principles of construction, and operation, it is apparent that various changes and, modifications may be made therein, Without departing from the spirit of my invention and I desire, therefore, that only such limitations shall be imposed thereon, as are indicated-in the appended claims or as are demanded by the prior art.

I claim:

1. In combination, a reversible motor having brush shifting mechanism, a switch for controlling the operation of said motor, means for substantially simultaneously actuating said mechanism and said switch, and means for automatically limiting the period of operation of said motor. I

2. In a dental unit, the combination WlQ-ll a dynamo-electric device having brush shifting mechanism for reversing the direction of operation thereof, of circuit-interrupting means for determining the operation of said cevice, common means for actuating said brush shifting mechanism and said circuitinterrupting means, dental chair lifting apparatus, and means actuated thereby for causing the operation of said circuit-interruptiug means upon a predetermined operation of said chair lifting apparatus.

8. A system of control. comprising a dynamo-electric device having a reversing element, a circuit-interrupting device for controlling the operation of said dynamo-electric device, a control element for the circuitinterrupting device, an actuating element for said reversing element, common means for operating said elements, a reversibly movable power member, and means actuated thereby for automatically limiting the range of movement of said dynamo-electric device.

l. ln combination, a dynamo-electric device havingspeed-control mechanism, a circuit-interrupting device for controlling the operation of said dynamo-electric device, actuating means for said circuit-interrupting device, a control element for said speedcontrol means, and a common actuating lever for said control element and said actuating means, said control element being ad justable to vary the time interval between the operation of said circnit-interrupting de vice and said speed-control mechanism.

5. In combination, a motor having speedcontrol means, a switch for controlling the operation of said motor, a control element having an operative connection with said speed-control means, an actuating element for said switch having adetachable connection with said control element, and means for rendering ineffective said connection.

(3. In combination, a motor having speedcontrol mechanism, a switch for controlling the operation of said motor, an actuating lever for said switch, a main. lever having an operative connection with said speed-control mechanism and a detachable connection with said actuating lever, and means operable to detach said actuating lever from said main lever under predetermined operating con ditions.

7. In combination, a motor having speedcontrol mechanism, a switch for controlling the operation of said motor and provided with an actuating lever, a common control lever operably associated with said speedcontrol mechanism and said actuating lever, whereby movement oit aid common control lever from a neutral position ei'lects the operation of said switch lever and said speedcontrol mechanism, and means for returning said common control lever to its neutral po sition.

8. In combination, a motor having speedcontrol mechanism, a switch for control ng the operation of said motor, an actuating lever for said switch, said switch-actuating lever being resiliently retained in a neutral position, and common actuating means for said speed-control mechanism and said switch-actuating lever.

9. In combination, a motor having speedcontrol mechanism, a switch for controlling the operation of said motor, said. switch be ing provided wit-h an actuating element resiliently held in a neutral position, and a control element also resiliently held in a neutral. position, said control element having an operative connection with said switchactuating element and said speed-control mechanism.

10. In a system of control, the combination with a motor provided with speed-control mechanism, of a switch for controlling the operation of said motor, an actuating element for said switch adapted to be held resiliently in a neutral position, a common actuating element for said speed-control mechanism and said switch-actuating element, and trip mechanism for disengaging the connection between said common-actuating element and said switch actuating element upon a predetermined range of movement of said motor.

11. A system of control comprising a motor provided with speed-control mechanism, a switch for controlling the operation of said motor, an actuating element for said switch adapted to be held normally in a neutral position, a common control element operable to actuate said switch element and said speed-control mechanism, and trip mechanism operable to break the connection be tween said common control element and said switch element permitting the latter to return to its neutral position, the connection between said common control element and said speed-control mechanism being adjustable.

12. A system of control comprising a motor provided with brush-shifting mechanism, a switch for controlling the operation of said motor, alever having an arm adjustably connected to said brush-shitting mechanism, and an operative connection between said switch and said lever, whereby said lever may actuate said brush-shitting mechanism and said switch.

13. In a system of control, the combination with a motor provided with brusln shifting mechanism for determining the direction oi operation thereof, of a control switch for said motor, an actuating element for said switch, and a main control lever provided with arms respectively connected to said brush-shifting mechanism and said switch-actuating element.

1 1-. A system of control comprising a motor provided with ln'uslrshiitting mechanism, a switch for controlling the operation of said motor, an actuating member for said switch provided with a movable arm, a main control element operatively associated with said brush-shitting mechanism and provided with a projection adapted to engage said movable arm, whereby a movement of said. main control element may cause a corresponding movement of said actuating member and said movable arm from their neutral position, and means automatically operable upon a predetermined range of motor operation to actuate said movable arm out of engagement with said maincontrol element projection to permit said switch-actuating member and said movable and to return to their neutral position.

ment, a main control element operatively associated with said mechanism and provided with an arm having spaced shoulders adapted to engage opposite sides of saidpivoted arm, whereby movement of said main control element in either direction from a neutral position causes a corresponding movement of said switch-actuating element, and means automatically operable to actuate said pivoted arm out of engagement with said shoulders, permitting said switchactuating element to return to its neutral position.

16. A motor provided with speed-control mechanism a switch for controlling the op eration of said motor, said switch being resiliently held in its open position, actuating means for said switch adapted to close the same when moved in either direction from a neutral position, a movable arm mounted on said switch-actuating means, a main control element having an operative connection with said speed-control mechanism and provided with an extension having shoulders adapted to engage opposite sides of said movable arm, means for resiliently retaining said main control element in a neutral position corresponding to the neutral position of the switch-actuating means, and safety means for actuating said movable am out of engagement with said shoulders when said main control element has been held out of its neutral position for a predetermined time interval, said movable arm and switch-actuating means being returned to their neutral position by the resilient force of the switch.

CLARENCE W. MOORE. 

